About 7,000 gallons of partially treated, but not completely disinfected sewage was dumped in Lake Wilson Wednesday night because of a power outage, the state Health Department said.

Signs are posted advising people to stay out of the reservoir for several days.

Oahu and Kauai are still under a brown water advisory following heavy rains earlier in the week. The Health Department advises people to stay out of flood waters and storm water runoff because of contamination from overflowing cesspools, sewer manholes, pesticides, animal fecal matter, dead animals, pathogens, chemicals, and associated flood debris. If coastal waters are turbid and brown, stay out, the health department said.